The talcum powder fix that I gave for line feed problems works for this problem too. The powder lubricates the line, eliminating the friction that melts the line. They are essentially just two parts of the same problem.

Put a couple of teaspoons full of talcum powder (baby powder, but NOT the kind with corn starch) in the bulk spool container. Shake it up in a zipper bag to thoroughly coat the line. Coat the inside of your spools with a light coat of talc.Then, load your spools with it. The talc lubricates the line, eliminating the friction that is melting the line.Put a couple of teaspoons full of talcum powder (baby powder, but NOT the kind with corn starch) in the bulk spool container. Shake it up in a zipper bag to thoroughly coat the line. Coat the inside of your spools with a light coat of talc.Then, load your spools with it. The talc lubricates the line, eliminating the friction that is melting the line.

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I think the melting is in your the head the feed that hods the line. That's the plastic bit. I have had this happen not just with one brand either. The problem is vibration. if things are not properly balanced the head vibrates, the resulting friction causes heat, that causes more wear and more heat. End of strimmer head! I not buy them two at a time on ebay!

The slots on the string spool are there just to hold the line in place so it doesn't unwind while you are putting the string head back together. You have the strings sticking up, you lower the casing with the eyelet holes down, feed the ends of the strings sticking up through the eyes and then yank them free of the slots so they can automatically feed. So yes, line goes from spool hub to spool slots to casing outlet holes and don't forget to pull it free of the slots.

The hole where the line comes through the plastic spool should have a metal grommet in it. If the hole is just plastic, then the line rubs against it and the heat cannot dissipate, so the line gets hot and melts.

Sorry I can't solve it yet but same thing happened to me...I took out all the screws holding the case together and could see that the drive belt from the motor to the shaft had worn away or melted...at any rate I could see it was in shreds...Have to see if there is any way to replace that belt

They come with a rig pin to lock the spool in place, then turn the large platic ball on the bottom of the trimmer head COUNTER CLOCKWISE. do not try to fill up the spool with line it will only get stuck and melt together. You should also sprinkle the line with baby powder as you wind it up as it reduces sticking too.

I did a lot of searching for a manual but I guess Argos does not want their customers to know how to use their product. When you are use the trimmer, most rotate clockwise. You may find on the spool an arrow showing direction to wind line. Otherwise you will have to take it apart the trimmer and remember with direction the spool turns. Wind the string on the same direction turns. plus try a little wd40 on the line to keep it from sticking together.Cheers.